Bryhn M, Persson S
Acta Med Scand. 1984;215(2):157-60. doi: 10.1111/j.0954-6820.1984.tb04986.x.
An asymptomatic population of 100 women and 101 men was studied with M-mode echocardiogram to determine the prevalence of mitral valve prolapse (MVP). One of the two patterns characteristic for MVP was found in 8% of the females and 7% of the males. The diastolic mitral valve excursion was significantly higher in the MVP group (p less than or equal to 0.001). A typical M-mode pattern in combination with a high mitral valve excursion probably enhances the diagnostic specificity.